3 inch manifold/header

rays87turbo · 11-23-2005, 04:48 AM

But if you have a turbo manifold, the collector connects to the turbo, not the exhaust. The exhaust housing of the turbo connects to the exhaust. That flange size is determined by the type of turbo you are using. If you were to get one with a 3" hole, your turbo wouldn't bolt up. The ones on the ebay auction you showed are designed for a turbo with a T4 exhaust flange. T4 turbos go from relatively small to super huge monsters, and they all use that flange. Full 3" exhaust really just includes a ported turbo elbow, or a custom downpipe with an integrated turbo elbow, then 3" all the way back. It doesn't include the collector on the manifold....the turbo is a restriction to that flow anyway (purposely).

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11-23-2005, 04:48 AM	#4
rays87turbo Stock Join Date: Nov 2005 Posts: 17	But if you have a turbo manifold, the collector connects to the turbo, not the exhaust. The exhaust housing of the turbo connects to the exhaust. That flange size is determined by the type of turbo you are using. If you were to get one with a 3" hole, your turbo wouldn't bolt up. The ones on the ebay auction you showed are designed for a turbo with a T4 exhaust flange. T4 turbos go from relatively small to super huge monsters, and they all use that flange. Full 3" exhaust really just includes a ported turbo elbow, or a custom downpipe with an integrated turbo elbow, then 3" all the way back. It doesn't include the collector on the manifold....the turbo is a restriction to that flow anyway (purposely).